feat: add struct binding example for URL parameters

[miclle]

Summary

This PR enhances the basic example by adding a demonstration of struct binding for URL parameters, showing developers two different ways to extract path parameters in Fox.

Changes

New Endpoint Added

GET /greet/:name - Demonstrates struct binding approach

type UserParams struct {
    Name string `uri:"name" binding:"required"`
}
router.GET("/greet/:name", func(params UserParams) string {
    return "Greetings, " + params.Name + "!"
})

Updated Documentation

• Updated README.md to include the new example
• Added curl command to test the new endpoint
• Added expected output example

Comparison of Two Approaches

1. Direct Parameter Access (existing)

router.GET("/hello/:name", func(ctx *fox.Context) string {
    name := ctx.Param("name")
    return "Hello, " + name + "!"
})

2. Struct Binding (new)

type UserParams struct {
    Name string `uri:"name" binding:"required"`
}
router.GET("/greet/:name", func(params UserParams) string {
    return "Greetings, " + params.Name + "!"
})

Benefits

• Shows developers both methods for parameter extraction
• Demonstrates Fox's automatic binding capabilities
• Struct binding approach provides built-in validation
• More idiomatic for complex parameter sets

Testing

# Start the example
cd examples/01-basic
go run main.go

# Test the new endpoint
curl http://localhost:8080/greet/alice
# Expected: Greetings, alice!

Files Changed

• examples/01-basic/main.go - Added UserParams struct and new endpoint
• examples/01-basic/README.md - Updated documentation

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.87%. Comparing base (433a040) to head (b0e27d3).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #44   +/-   ##
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  Coverage   87.87%   87.87%           
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  Files          16       16           
  Lines         726      726           
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  Hits          638      638           
  Misses         70       70           
  Partials       18       18           

Flag	Coverage Δ
unittests	87.87% <ø> (ø)

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